77 lines
1.9 KiB
C
77 lines
1.9 KiB
C
|
/*
|
||
|
|
* Copyright (c) 2003, 2007-14 Matteo Frigo
|
||
|
|
* Copyright (c) 2003, 2007-14 Massachusetts Institute of Technology
|
||
|
|
*
|
||
|
|
* This program is free software; you can redistribute it and/or modify
|
||
|
|
* it under the terms of the GNU General Public License as published by
|
||
|
|
* the Free Software Foundation; either version 2 of the License, or
|
||
|
|
* (at your option) any later version.
|
||
|
|
*
|
||
|
|
* This program is distributed in the hope that it will be useful,
|
||
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
|
|
* GNU General Public License for more details.
|
||
|
|
*
|
||
|
|
* You should have received a copy of the GNU General Public License
|
||
|
|
* along with this program; if not, write to the Free Software
|
||
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
|
||
|
|
|
||
|
|
#include "kernel/ifftw.h"
|
||
|
|
|
||
|
|
#if HAVE_NEON
|
||
|
|
|
||
|
|
/* check for an environment where signals are known to work */
|
||
|
|
#if defined(unix) || defined(linux)
|
||
|
|
# include <signal.h>
|
||
|
|
# include <setjmp.h>
|
||
|
|
|
||
|
|
static jmp_buf jb;
|
||
|
|
|
||
|
|
static void sighandler(int x)
|
||
|
|
{
|
||
|
|
UNUSED(x);
|
||
|
|
longjmp(jb, 1);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int really_have_neon(void)
|
||
|
|
{
|
||
|
|
void (*oldsig)(int);
|
||
|
|
oldsig = signal(SIGILL, sighandler);
|
||
|
|
if (setjmp(jb)) {
|
||
|
|
signal(SIGILL, oldsig);
|
||
|
|
return 0;
|
||
|
|
} else {
|
||
|
|
/* paranoia: encode the instruction in binary because the
|
||
|
|
assembler may not recognize it without -mfpu=neon */
|
||
|
|
/*asm volatile ("vand q0, q0, q0");*/
|
||
|
|
asm volatile (".long 0xf2000150");
|
||
|
|
signal(SIGILL, oldsig);
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
int X(have_simd_neon)(void)
|
||
|
|
{
|
||
|
|
static int init = 0, res;
|
||
|
|
|
||
|
|
if (!init) {
|
||
|
|
res = really_have_neon();
|
||
|
|
init = 1;
|
||
|
|
}
|
||
|
|
return res;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
#else
|
||
|
|
/* don't know how to autodetect NEON; assume it is present */
|
||
|
|
int X(have_simd_neon)(void)
|
||
|
|
{
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#endif
|